Hi Mike, I have had a similar problem and found it was the battery. I know you probably have thought of it but I will tell you my story. I took the car to an auto part repair place and they tested the battery and said it was okey. I took it to the main dealer in Limoges and there super tester said the battery was faulty. There price was okey so they changed it but tried to charge for testing which I objected to because they didnt tell me in advance that there was a charge.I think the Chrysler Voyager battery is too small for the car. I have seen on You Tube super small pocket size batterys that would eliminate jumper cables for ever. I notice you are in France like me, any idea where I can obtain parts filters etc to service.